Air knife, air blowing assembly and cleaning method of air knife

Abstract

The invention discloses an air knife, an air blowing assembly and a cleaning method thereof. The air knife is used for cleaning the surface of a battery piece and comprises a metal air pipe, a cavity is formed in the air pipe, air inlet holes are formed in the air pipe, air hole sets distributed in parallel are formed in the end face of the air pipe, the air hole sets are composed of equidistant air holes, and a specific included angle is formed between the axis connecting line of the air holes and the moving path of the battery piece so that uniform airflow can be provided for cleaning electroplating liquid on the surface of the battery piece. The air blowing assembly comprises two oppositely-arranged air knives, air hole sets are opposite, a battery piece conveying space is reserved, the upper end surface and the lower end surface of a battery piece are cleaned at the same time, and a support and a cover plate are further arranged. The surface cleaning method comprises the steps that the conveying device drives the battery piece to horizontally move between the two air knives, high-pressure gas is conveyed into the air pipes, air is blown to the surface of the battery piece from the air hole sets, through airflow cooperation of the upstream air hole set and the downstream air hole set, an air barrier is formed, the tension of electroplating liquid is broken, and surface cleaning of the battery piece is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of photovoltaic processing, in particular to an air knife, an air blowing component and a cleaning method thereof. Background Art

[0002] With the rapid development of the new energy industry, the production quality and efficiency of cells, as the core components of solar cells, play a vital role in the development of the entire photovoltaic industry chain. In the production process of cells, surface cleaning is a key process link. Since cells will inevitably adhere to impurities such as plating liquid during the production process, the presence of these impurities will seriously affect the performance of the cells, reduce the photoelectric conversion efficiency, and may even cause the cells to be scrapped. Therefore, how to efficiently and evenly remove the plating liquid on the surface of the cells has become a technical problem that needs to be solved in the production of cells.

[0003] Traditional methods for cleaning the surface of battery cells usually use water washing or chemical solvent cleaning, but these methods have many shortcomings. Water washing is prone to introduce new impurities and the cleaning effect is unstable; although chemical solvent cleaning has a better cleaning effect, it has problems of environmental pollution and high cost. In recent years, with the development of pneumatic technology, the method of using air knives to clean the surface of battery cells has gradually attracted attention. However, the existing air knife technology still has some problems in practical applications.

[0004] Existing air knives often have only one row, which often cannot provide uniform airflow, resulting in incomplete cleaning of the cell surface and possible residual plating liquid in some areas.

[0005] For this purpose, we propose an air knife, an air blowing assembly and a cleaning method thereof. Summary of the invention

[0006] In view of the shortcomings of the above-mentioned existing production technology, the applicant provides an air knife, a blowing assembly and a cleaning method thereof. Through the unique inclination angle design of the air hole group, efficient cleaning is achieved and the surface tension of the electroplating liquid is broken, which not only shortens the size of the air duct but also improves the energy utilization efficiency.

[0007] The technical solution adopted by the present invention is as follows:

[0008] A wind knife, used for cleaning the surface of a battery cell, comprising:

[0009] The air duct is provided with a cavity, and the cavity is provided with at least one air inlet hole, and at least one end surface of the air duct is provided with at least two air hole groups;

[0010] The air hole group includes a plurality of air holes distributed in a straight line, and a line connecting the axes of the plurality of air holes forms an angle α with the moving path of the battery sheet;

[0011] The two air hole groups are divided into an upstream air hole group and a downstream air hole group according to the process transmission direction of the battery cell. The air flow in the air holes of the upstream air hole group is perpendicular to the upper end surface of the battery cell, and an included angle β is formed between the air flow in the air holes of the downstream air hole group and the upper end surface of the battery cell, and it satisfies: 0° ≤ β ≤ 30°.

[0012] As a further improvement of the above technical solution:

[0013] In one embodiment, the included angle α satisfies: 45° ≤ α ≤ 90°;

[0014] In one embodiment, the diameter R of the air hole satisfies: 0.15 mm ≤ R ≤ 0.5 mm, the distance L between two adjacent air holes satisfies: 1.5 mm ≤ L ≤ 9 mm, and the ratio of the air hole diameter R to the air hole distance L satisfies: 1:(5 - 15).

[0015] In one embodiment, an air distribution plate is arranged in the air duct. The upper and lower ends of the air distribution plate are connected to the inner wall of the air duct through connecting pieces. The air distribution plate is provided with air distribution holes. The air distribution plate divides the air duct into at least two chambers, and the air inlet hole and the air hole group are located in two different chambers.

[0016] In one embodiment, the two air hole groups are arranged in parallel, and the air holes in the air hole group are equally spaced.

[0017] The air duct is divided into multiple sections, and each section is provided with two air hole groups.

[0018] A blowing assembly includes the above-mentioned air knife. The air hole groups of the two air knives are arranged oppositely, and a battery cell conveying space is reserved between the two air knives (the battery cell moves between the two air knives to realize simultaneous cleaning of the upper and lower end surfaces of the battery cell).

[0019] As a further improvement of the above technical solution:

[0020] It further includes a bracket for connecting the two air knives into a whole.

[0021] A metal rod is arranged in the air duct. The length of the metal rod is more than 50% of the length of the air duct, and the metal rod is arranged along the length direction of the air duct.

[0022] A cover plate is arranged on the air duct. The air inlet hole is arranged on the cover plate. The number of air inlet holes is at least one and they are evenly distributed on the cover plate.

[0023] A surface cleaning method uses the above-mentioned blowing assembly and includes the following steps:

[0024] S1. Drive the battery cell to move horizontally between the two air knives through a conveying device;

[0025] S2. Deliver high-pressure gas into the air duct through the air inlet hole, and blow air onto the surface of the battery cell from the air hole group;

[0026] S3. The air flow of the upstream air hole group vertically contacts the battery cell and forms an air barrier to block the electroplating solution on the battery cell;

[0027] S4. The air flow of the downstream air hole group obliquely contacts the surface of the battery cell, and cooperates with the air flow of the upstream air hole group to strengthen the air barrier to prevent the electroplating solution from breaking through the air barrier and adhering to the surface of the battery cell. At the same time, the air flow direction of the downstream air hole group is opposite to the moving direction of the battery cell to prevent the electroplating solution from moving along with the battery cell;

[0028] S5. Both the upstream air hole group and the downstream air hole group adopt an inclined design, which can break the surface tension of the electroplating solution and better remove the electroplating solution.

[0029] The beneficial effects of the present invention are as follows:

[0030] The structure of the present invention is compact, reasonable, and easy to operate. Through the unique design of the inclined angle of the air hole group, efficient cleaning and breaking of the surface tension of the electroplating solution are achieved, which not only shortens the size of the air duct but also improves the energy utilization efficiency. The synergistic effect of the upstream and downstream air hole groups forms an air barrier and shear eddy currents, effectively preventing the electroplating solution from adhering. By setting the relative air flow direction and the moving direction of the battery cell, the synchronous movement of the electroplating solution and the battery cell is destroyed by the shear force, enhancing the cleaning effect. In terms of structural design, the setting of the air distribution plate ensures the uniform distribution of the air flow and improves the cleaning quality; the addition of multiple sections of air ducts and metal rods enhances the stability and reliability of the equipment; the design of the bracket and the cover plate ensures the relative position of the air knife and the air inlet effect. These designs work together to not only improve the efficiency and effect of cleaning the surface of the battery cell but also enhance the overall performance and stability of the equipment, providing a reliable solution for the surface cleaning in the production process of the battery cell.

[0031] At the same time, the present invention also has the following advantages:

[0032] Summary of beneficial effects

[0033] The air knife and blowing assembly of the present invention achieve efficient cleaning of the surface of solar cells through a unique air hole group design. The air hole group includes a plurality of air holes arranged in a straight line, and the connecting line of the axes of the plurality of air holes forms an angle α (45° ≤ α ≤ 90°) with the moving path of the solar cell, and generally preferably 75° - 85°. This design can, on the one hand, shorten the length and width of the air duct, and on the other hand, break the surface tension of the electroplating solution on the surface of the solar cell. Specifically, the upstream and downstream air hole groups form a cooperative flow field through different inclination angle configurations: the upstream uses a small-angle co-directional inclination to generate a pre-shear cutting to weaken the structural strength of the liquid film, and the downstream uses a large-angle reverse inclination to generate a high-intensity shear vortex. This design enables the dynamic pressure component of the air flow to break through the surface tension threshold of the liquid film, and at the same time, destroys the adhesion at the liquid-solid interface through the velocity gradient, ultimately achieving the dynamic stripping of the electroplating solution. For example, when α is 90 degrees, the air flow blown out by the air hole group is always the same size as one side of the solar cell, and it cannot break the surface tension of the solar cell, and a larger air flow is required to achieve a better cleaning effect; when α < 45°, it will cause the length of the air hole group to be too large, resulting in energy waste. Through reasonable angle design, while ensuring the cleaning effect, the energy utilization efficiency is improved.

[0034] In the present invention, the two air hole groups are divided into an upstream air hole group and a downstream air hole group according to the process transmission direction of the solar cell. The air flow of the air holes in the upstream air hole group is perpendicular to the upper end surface of the solar cell, vertically contacts the solar cell and forms an air barrier to block the electroplating solution on the solar cell. At the same time, as the solar cell moves, the electroplating solution converges together. An angle β (0° ≤ β ≤ 30°) is formed between the air flow of the air holes in the downstream air hole group and the upper end surface of the solar cell, and the air flow obliquely contacts the surface of the solar cell. On the one hand, it cooperates with the air flow of the upstream air hole group to strengthen the air barrier to prevent the electroplating solution from breaking through the air barrier and adhering to the surface of the solar cell. On the other hand, the air flow direction is opposite to the moving direction of the solar cell to prevent the electroplating solution from moving together with the solar cell. By using shear force / reverse momentum transfer, the synchronous movement of the electroplating solution and the solar cell is destroyed.

[0035] The air knife and the blowing assembly of the present invention are optimized in structural design, improving the stability and reliability of the equipment. An air distribution plate is arranged in the air duct, which divides the air duct into at least two chambers, and the air inlet holes and the air hole groups are in two chambers. The air distribution effect is achieved through the air distribution plate, making the air flow in each air hole more evenly distributed on the surface of the battery cell. The air duct is divided into multiple sections, and each section is provided with two air hole groups, which can achieve the effect of cleaning multiple battery cells simultaneously and improve the working efficiency. In addition, due to the increase in the length of the air duct, in order to improve the strength of the air duct, a metal rod is arranged in the air duct. The length of the metal rod is more than 50% of the length of the air duct, and the metal rod is arranged along the length direction of the air duct to prevent the air duct from being damaged. The blowing assembly further includes a bracket for connecting the two air knives into a whole, so that the relative positions of the two air knives remain unchanged, that is, the distance between the air holes and the surface of the battery cell remains unchanged. A cover plate is arranged on the air duct, and the air inlet holes are arranged on the cover plate. The number of the air inlet holes is at least one and is evenly distributed on the cover plate to provide gas with sufficient pressure to the air duct. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 FIG. is a schematic structural diagram of the air knife of the present invention.

[0037] Figure 2 is Figure 1 a partial enlarged view of part A in FIG.

[0038] Figure 3 is Figure 2 a partial enlarged view of part B in FIG.

[0039] Figure 4 is Figure 2 a cross-sectional view taken along the line C-C in FIG.

[0040] Figure 5 FIG. is a schematic structural diagram of the blowing assembly in the present invention.

[0041] Figure 6 FIG. is a cross-sectional view of the blowing assembly in the present invention.

[0042] Figure 7 is Figure 6 a cross-sectional view taken along the line D-D in FIG.

[0043] Wherein:

[0044] 100, air knife; 200, bracket; 300, cover plate; 400, metal rod;

[0045] 101, air duct; 102, air hole group; 1021, upstream air hole group; 1022, downstream air hole group; 1023, air hole; 103, air inlet hole; 104, air distribution plate. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0046] The following will describe the specific embodiments of the present invention in conjunction with the accompanying drawings.

[0047] In order to make the above objects, features and advantages of the present application more obvious and understandable, the following will give a detailed description of the specific embodiments of the present application in conjunction with the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0048] In the description of the present application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present application.

[0049] In addition, if terms such as "first" and "second" appear, these terms are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0050] In the present application, unless otherwise clearly specified and limited, if terms such as "installation", "connection", "connection", "fixation" appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0051] In this application, unless otherwise clearly specified and defined, when a first feature is described as being "on" or "under" a second feature or the like, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "under" the second feature may be that the first feature is directly below or obliquely below the second feature, or simply indicates that the first feature has a lower horizontal height than the second feature.

[0052] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. If an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. If so, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are only for the purpose of illustration and do not represent the only implementation.

[0053] Embodiment 1

[0054] As Figures 1-4 shown, this embodiment discloses an air knife 100 for cleaning the surface of a battery cell, which includes an air duct 101. The air duct 101 is made of a metal material such as stainless steel or aluminum alloy to improve its strength. These metal materials have the characteristics of high strength, corrosion resistance and high temperature resistance, and are suitable for use in high-pressure and high-speed air flow environments, thereby ensuring the long-term stable operation of the air knife 100.

[0055] Specifically, as Figure 2 shown, the air duct 101 in this embodiment is provided with a cavity, and at least one air inlet hole 103 is opened on the cavity for supplementing high-pressure gas. Usually, an inert gas such as nitrogen or argon is used. These gases will not chemically react with the battery cell, thereby avoiding contamination of the battery cell. At the same time, the high-pressure gas can provide sufficient power to ensure the cleaning effect. And at least two air hole groups 102 are opened on at least one end face of the air duct 101, that is, the end face facing the battery cell. This design ensures that the gas can be evenly blown onto the surface of the battery cell to achieve a comprehensive cleaning effect.

[0056] In this embodiment, the surface of the air duct 101 facing the battery cell is designed as a plane, but in other embodiments, a non-planar design can also be adopted. For example, a curved surface can also achieve the corresponding effect, but a plane is easy to process.

[0057] As Figures 2-3As shown, the wind hole group 102 in this embodiment includes a plurality of wind holes 1023 distributed in a straight line, and the two wind hole groups 102 are arranged in parallel. The wind holes 1023 in the wind hole group 102 are evenly distributed, which can provide a more uniform airflow and evenly clean the plating liquid on the surface of the battery cell. The evenly distributed wind holes 1023 can ensure that the airflow intensity in each area is consistent, thereby avoiding the problem of incomplete local cleaning.

[0058] like Figure 3 As shown, the line connecting the axes of the multiple air holes 1023 forms an angle α with the moving path of the battery cell, and satisfies: 45°≤α≤90°. The specific angle is determined by the width of the air duct 101, that is, the air hole group 102 is arranged along the direction of the docking line of each section of the air duct 101. By adjusting the angle α, the direction and intensity of the air flow can be optimized, so as to better adapt to batteries of different sizes and shapes. When α is 90 degrees, that is, the arrangement of the air hole group 102 is perpendicular to the moving direction of the battery cell, the surface of the battery cell can also be cleaned at this time, but the airflow blown out by the air hole group 102 is always the same as the size of one side of the battery cell, and the tension on the surface of the battery cell cannot be broken, so a larger airflow is required to better achieve the cleaning effect. Although the vertically arranged air hole group 102 can provide uniform airflow, since the airflow direction is perpendicular to the moving direction of the battery cell, the surface tension of the electroplating solution cannot be effectively broken, resulting in poor cleaning effect.

[0059] When α is less than 45°, there is usually not enough space to arrange the vent group 102. On the other hand, the length of the vent group 102 will be too large, resulting in energy waste. It is generally preferred to be between 75° and 85°. On the one hand, the length and width of the air duct 101 can be shortened. On the other hand, the surface tension of the electroplating liquid of the battery cell can also be broken. This is because the upstream and downstream vent groups 102 form a synergistic flow field through differentiated inclination angle configurations: the upstream uses a small angle of inclination in the same direction to produce pre-shearing to weaken the strength of the liquid film structure, and the downstream uses a large angle of reverse inclination to generate high-intensity shear vortices. Through differentiated inclination angle configurations, a synergistic flow field can be formed, thereby more effectively breaking the surface tension of the electroplating liquid and improving the cleaning effect. This design enables the airflow pressure component to break through the threshold of the surface tension of the liquid film, and at the same time destroys the liquid-solid interface adhesion through the velocity gradient, and finally realizes the dynamic stripping of the electroplating liquid. This design not only improves the cleaning effect, but also reduces energy consumption and improves overall efficiency.

[0060] In addition, the two air hole groups 102 are divided into an upstream air hole group 1021 and a downstream air hole group 1022 according to the process transmission direction of the battery cell. The airflow of the air holes 1023 in the upstream air hole group 1021 is perpendicular to the upper end surface of the battery cell. The airflow of the upstream air hole group 1021 vertically contacts the battery cell and forms an air barrier to block the plating liquid on the battery cell. At the same time, as the battery moves, the plating liquid converges together. The air barrier formed by the vertical airflow can effectively block the plating liquid and prevent it from adhering to the surface of the battery cell. At the same time, as the battery cell moves, the plating liquid will converge together to facilitate subsequent processing.

[0061] However, the airflow of the air holes 1023 in the downstream air hole group 1022 forms an angle β with the upper end surface of the battery cell. The airflow of the downstream air hole group 1022 obliquely contacts the surface of the battery cell. On the one hand, it cooperates with the airflow of the upstream air hole group 1021 to strengthen the air barrier to prevent the plating solution from breaking through the air barrier and adhering to the surface of the battery cell, and satisfies: 0°≤β≤30°, so that the airflow blown out of the downstream air hole group 1022 at least does not touch the airflow blown out of the upstream air hole group 1021, thereby causing collisions between the airflows, which affects the effect of the upstream air barrier on the one hand, and also affects the airflow blowing effect of the downstream air hole group 1022 on the other hand. By adjusting the angle β, it can be ensured that the airflow of the downstream air hole group 1022 will not collide with the airflow of the upstream air hole group 1021, thereby improving the cleaning effect. Since the width of the air duct 101 is limited and the spacing between the two air hole groups is not large, it is also necessary to determine the β value when the spacing between the two is determined, that is, when the spacing between the two is reduced, the upper limit of β needs to be reduced, and when the spacing is expanded, the upper limit of β needs to be increased.

[0062] When β>30°, two airflows will collide. At the same time, the distance between the upstream air hole group 1021 and the downstream air hole group 1022 must also be considered.

[0063] When β is less than 0°, the projection of the airflow direction on the horizontal plane is consistent with the conveying direction of the solar panel, and the cleaning effect cannot be achieved. When β is equal to 0°, another barrier will be produced. Although it can also achieve a cleaning effect, the cleaning effect is not ideal. The specific principle is to form a pressure gradient through the superposition of airflow, so that the longitudinal strength of the aerodynamic barrier is improved, and the resistance of the air barrier to the penetration of the electroplating liquid is improved, which is similar to the reinforcement and thickening of flood control dams. On the other hand, the airflow direction of the downstream air hole group 1022 is relative to the moving direction of the battery cell to prevent the plating solution from moving with the battery cell; the shear force / reverse momentum transfer is used to destroy the movement synchronization of the plating solution and the battery cell, which is similar to using a high-pressure water gun to flush the surface of an object. By adjusting the β angle, the direction and intensity of the airflow can be optimized, thereby more effectively breaking the surface tension of the plating solution and improving the cleaning effect.

[0064] In this embodiment, Figure 3As shown, the diameter R of the air holes 1023 satisfies: 0.15 mm ≤ R ≤ 0.5 mm, the spacing L between two adjacent air holes 1023 satisfies: 1.5 mm ≤ L ≤ 9 mm, and the ratio of the diameter R of the air holes 1023 to the spacing L of the air holes 1023 satisfies: 1:(5 - 15). By optimizing the diameter and spacing of the air holes 1023, the uniform distribution of the air flow can be ensured, and the cleaning effect can be improved.

[0065] That is to say, the smaller the diameter of the air holes 1023, the smaller the gas consumption, the larger the wind speed, but the smaller the spacing between the air holes 1023. In order to cover the entire end face, more air holes 1023 need to be used; on the contrary, the larger the diameter of the air holes 1023, the larger the gas consumption, the smaller the wind speed, and the spacing between the air holes 1023 can be appropriately enlarged. Fewer air holes 1023 can be used to cover the entire end face of the battery cell. By adjusting the diameter and spacing of the air holes 1023, the direction and intensity of the air flow can be optimized, so as to more effectively break the surface tension of the electroplating solution and improve the cleaning effect.

[0066] When the diameter of the air holes 1023 is 0.25 mm, combined with the height of the air hole group 102 from the battery cell being 4 - 5 mm with a thickness of 130 μm, the diffusion area formed on the surface of the battery cell is approximately 0.5 - 1.05 mm 2 , and the actual diffusion area is greater than 4.9 mm 2 , the spacing between the air holes 1023 is about 2.5 mm, and a good and continuous liquid cutting effect is obtained. This design can provide a uniform and strong air flow, thus achieving a good cleaning effect. And when one of the air holes 1023 is blocked, the adjacent air holes 1023 can also cover the corresponding area.

[0067] When the diameter of the air holes 1023 is to be increased to 0.5 mm, the spacing between the air holes 1023 needs to be 5 mm to form a stable air barrier. This increases the gas consumption of the customer, reduces the wind speed, and at the same time increases the risk of partial non-drying when a single air hole 1023 is blocked. Although a larger diameter of the air holes 1023 can reduce the number of air holes 1023, it will increase the gas consumption and reduce the wind speed. When one of the air holes 1023 is blocked, the air flow is not sufficient to cover the entire surface.

[0068] In the air duct 101 of this embodiment, a wind - uniforming plate 104 is provided. The upper and lower ends of the wind - uniforming plate 104 are connected to the inner wall of the air duct 101 through connectors. The wind - uniforming plate 104 is provided with wind - uniforming holes. The wind - uniforming plate 104 divides the air duct 101 into at least two chambers, and the air inlet hole 103 and the air hole group 102 are located in two different chambers. The effect of wind uniforming is achieved through the wind - uniforming plate 104. The wind - uniforming plate 104 can ensure the uniform distribution of the air flow, thereby improving the cleaning effect.

[0069] In this embodiment, the air duct 101 is divided into multiple sections, and each section is provided with two air hole groups 102. By dividing the air duct 101 into multiple sections, the effect of cleaning multiple solar cells simultaneously can be achieved, improving work efficiency. Additionally, since the length of the air duct 101 increases, in order to improve the strength of the air duct 101, a metal rod 400 needs to be provided in the air duct 101. The length of the metal rod is more than 50% of the length of the air duct 101, and the metal rod is arranged along the length direction of the air duct 101 to prevent the air duct 101 from being damaged. By dividing the air duct 101 into multiple sections, multiple solar cells can be cleaned simultaneously, thereby improving work efficiency. At the same time, the metal rod 400 can increase the strength of the air duct 101 and prevent it from being damaged during use.

[0070] Embodiment 2

[0071] As Figures 5-7 shown, in this embodiment, a blowing assembly is disclosed, which includes two air knives 100 in Embodiment 1. The air hole groups 102 of the two air knives 100 are arranged oppositely, and a conveying space for the solar cell is reserved between the two air knives 100. The solar cell moves between the two air knives 100 to achieve simultaneous cleaning of the upper and lower surfaces of the solar cell. Through the oppositely arranged air knives 100, the upper and lower surfaces of the solar cell can be cleaned simultaneously, thereby improving the cleaning effect.

[0072] The blowing assembly in this embodiment further includes a bracket 200, which is used to connect the two air knives 100 into a whole, so that the relative positions of the two air knives 100 remain unchanged, that is, the distance between the air holes 1023 and the surface of the solar cell remains unchanged. During actual use, the distance from the air knife 100 below the solar cell to the solar cell is closer because the air knife 100 below needs to overcome the gravity. The bracket 200 can ensure that the relative positions of the two air knives 100 remain unchanged, thereby improving the cleaning effect. At the same time, the air knife 100 below is closer to the solar cell, which can better overcome the gravity and ensure the cleaning effect.

[0073] A cover plate 300 is provided on the air duct 101 in this embodiment. The air inlet holes 103 are arranged on the cover plate 300. The number of air inlet holes 103 is at least one and is evenly distributed on the cover plate 300. When the number of air inlet holes 103 is one, it is usually located in the middle of the cover plate 300. When the number of air inlet holes 103 is greater than one, they will be evenly distributed on the cover plate 300 to supply gas with sufficient pressure to the air duct 101. The cover plate 300 can protect the air duct 101. At the same time, the even distribution of the air inlet holes 103 can ensure that the gas enters the air duct 101 evenly, thereby improving the cleaning effect.

[0074] Embodiment 3

[0075] This embodiment discloses a surface cleaning method, which includes the blowing component in Embodiment 2 and is used to clean the surface of the battery cell. Specifically, it includes the following steps:

[0076] S1. Drive the battery cell to move horizontally between two air knives 100 through the conveying device, so that the two air knives 100 can better clean the upper and lower surfaces of the battery cell, and at the same time, the side edges of the battery cell can also be processed. Driving the battery cell to move through the conveying device can ensure that all surfaces of the battery cell can be cleaned, thereby improving the cleaning effect.

[0077] S2. Convey high-pressure gas, usually inert gas, into the air duct 101 through the air inlet hole 103, and blow air from the air hole group 102 to the surface of the battery cell. After these inert high-pressure gases are evenly distributed by the air distribution plate 104, they blow air to the battery cell through the air hole group 102. The air hole group 102 can also play a certain role in air distribution, making the air flow in each air hole 1023 more evenly distributed on the surface of the battery cell. By using high-pressure inert gas, sufficient power can be provided to ensure the cleaning effect. At the same time, the air distribution effects of the air distribution plate 104 and the air hole group 102 can ensure the uniform distribution of the air flow, thereby improving the cleaning effect.

[0078] S3. The air flow of the upstream air hole group 1021 contacts the battery cell vertically and forms an air barrier to block the electroplating solution on the battery cell. At the same time, as the battery cell moves, these electroplating solutions will gather together. The air barrier formed by the vertical air flow can effectively block the electroplating solution and prevent it from adhering to the surface of the battery cell. At the same time, as the battery cell moves, the electroplating solutions will gather together, which is convenient for subsequent processing.

[0079] S4. The air flow of the downstream air hole group 1022 contacts the surface of the battery cell obliquely, cooperating with the air flow of the upstream air hole group 1021 to strengthen the air barrier, which can gather more electroplating solutions and at the same time prevent the electroplating solutions from accumulating too much and breaking through the air barrier and adhering to the surface of the battery cell. At the same time, the projection of the air flow direction of the downstream air hole group 1022 on the horizontal plane is opposite to the moving direction of the battery cell. As the battery cell moves, it can better block the electroplating solution and blow it off the battery cell. The inclined air flow can cooperate with the vertical air flow to form a stronger air barrier, thereby more effectively blocking the electroplating solution. At the same time, the air flow direction of the downstream air hole group 1022 is opposite to the moving direction of the battery cell, which can better block the electroplating solution and blow it off the battery cell.

[0080] S5. Both the upstream air hole group 1021 and the downstream air hole group 1022 adopt an inclined design. By changing the contact area between the air flow and the battery cell, the surface tension of the electroplating solution can be broken, and the electroplating solution can be better removed. Through the differential inclined angle configuration, a cooperative flow field can be formed, thereby more effectively breaking the surface tension of the electroplating solution and improving the cleaning effect.

[0081] In summary, in this embodiment, the air knife 100 and the blowing assembly can more effectively break the surface tension of the electroplating solution and improve the cleaning effect by optimizing the direction and intensity of the air flow. At the same time, through reasonable structural design, the long-term stable operation of the equipment can be ensured and the overall efficiency can be improved.

[0082] The above description is an interpretation of the present invention, not a limitation of the invention. For the scope defined by the present invention, refer to the claims. Any form of modification can be made within the protection scope of the present invention.

Claims

1. A wind knife, which is used for cleaning the surface of battery wafers, is characterized in that Including: An air duct, which is provided with a cavity, at least one air inlet hole is opened on the cavity, and at least two air hole groups are opened on at least one end face of the air duct; The air hole group includes a plurality of air holes distributed in a straight line, and the connecting line of the axes of the plurality of air holes forms an included angle α with the moving path of the battery slice; The two air hole groups are divided into an upstream air hole group and a downstream air hole group according to the process transmission direction of the battery slice. The air flow of the air holes in the upstream air hole group is perpendicular to the upper end face of the battery slice, and an included angle β is formed between the air flow of the air holes in the downstream air hole group and the upper end face of the battery slice, and it satisfies: 0°≤β≤30°.

2. The air knife according to claim 1, wherein: The included angle α satisfies: 45°≤α≤90°; The diameter R of the air hole satisfies: 0.15mm≤R≤0.5mm, the distance L between adjacent two air holes satisfies: 1.5mm≤L≤9mm, and the ratio of the air hole diameter R to the air hole distance L satisfies: 1:(5 - 15).

3. The air knife according to claim 1, characterized in that: An air distribution plate is arranged in the air duct. The upper and lower ends of the air distribution plate are connected to the inner wall of the air duct through connecting pieces. The air distribution plate is provided with air distribution holes. The air distribution plate divides the air duct into at least two chambers, and the air inlet hole and the air hole group are located in two chambers respectively.

4. The air knife according to claim 1, characterized in that: The two air hole groups are arranged in parallel, and the air holes in the air hole group are equally spaced.

5. The air knife according to claim 1, characterized in that: The air duct is divided into multiple sections, and each section is provided with two air hole groups.

6. A blowing component, characterized in that: It includes two air knives of any one of claims 1 - 4. The air hole groups of the two air knives are arranged oppositely, and a battery slice conveying space is reserved between the two air knives (the battery slice moves between the two air knives to realize simultaneous cleaning of the upper and lower end surfaces of the battery slice).

7. The blowing component according to claim 6, wherein: It further includes a bracket, which is used to connect the two air knives into a whole.

8. The hair blowing assembly according to claim 6, wherein: A metal rod is arranged in the air duct. The length of the metal rod is more than 50% of the length of the air duct, and the metal rod is arranged along the length direction of the air duct.

9. The hair dryer assembly according to claim 6, wherein: A cover plate is arranged on the air duct. The air inlet hole is arranged on the cover plate. The number of the air inlet holes is at least one and they are evenly distributed on the cover plate.

10. A surface cleaning method, characterized in that: Using the blowing assembly of any one of claims 6 - 9, it includes the following steps: S1. Drive the battery slice to move horizontally between the two air knives through a conveying device; S2. Convey high-pressure gas into the air duct through the air inlet hole and blow air from the air hole group to the surface of the battery slice; S3. The air flow of the upstream air hole group contacts the battery slice vertically to form an air barrier and block the electroplating solution on the battery slice; S4. The air flow of the downstream air hole group contacts the surface of the battery slice obliquely, cooperates with the air flow of the upstream air hole group to strengthen the air barrier to prevent the electroplating solution from breaking through the air barrier and adhering to the surface of the battery slice. At the same time, the air flow direction of the downstream air hole group is opposite to the moving direction of the battery slice to prevent the electroplating solution from moving along with the battery slice; S5. Both the upstream air hole group and the downstream air hole group adopt an inclined design, which can break the surface tension of the electroplating solution and better remove the electroplating solution.

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